S32 SDK
MPU Memory Protection

Example application that shows how to use the MPU module

Application description


The purpose of this demo application is to show you how to use the Memory Protection Unit of the S32K148 MCU with this SDK.

In this example, MPU regions are configured to have access rights as following:

Region Core Debugger DMA Address
1 rwx rwx rwx 0x00000000 - 0x0007FEFF
2 -w- rwx rwx 0x0007FF00 - 0x0007FF1F
3 rwx rwx rwx 0x0007FF20 - 0xFFFFFFFF

Run the example

  1. After reset, GREEN LED of FRDM board always toggles indicating that read to flash location 0x0007FF04 is permitted
  2. Press SW2 to initialize MPU protection, and core has no read access to memory region from 0x0007FF00 to 0x0007FF1F.
  3. RED LED on indicates there is violated read access. The program is stopped hardware fault exception handler after get detail error access information.

Prerequisites


The run the example you will need to have the following items:

  • 1 S32K148 board
  • 1 Power Adapter 12V (if the board cannot be powered from the USB port)
  • 1 Personal Computer
  • 1 Jlink Lite Debugger (optional, users can use Open SDA)

Boards supported


The following boards are supported by this application:

  • S32K148EVB-Q100
  • S32K148-MB

Hardware Wiring


The following connections must be done to for this example application to work:

PIN FUNCTION S32K148EVB-Q100 S32K148-MB
RED_LED (PTD15) RGB_RED - wired on the board J12.17 - J11.31
GREEN_LED (PTD16) RGB_GREEN - wired on the board J12.16 - J11.30

How to run


1. Importing the project into the workspace

After opening S32 Design Studio, go to File -> New S32DS Project From... and select mpu_memory_protection_s32k148. Then click on Finish.
The project should now be copied into you current workspace.

2. Generating the Processor Expert configuration

First go to Project Explorer View in S32 DS and select the current project(mpu_memory_protection_s32k148). Then go to Project and click on Generate Processor Expert Code
Wait for the code generation to be completed before continuing to the next step.

3. Building the project

Select the configuration to be built FLASH (Debug_FLASH) or RAM (Debug_RAM) by left clicking on the downward arrow corresponding to the build button(. Wait for the build action to be completed before continuing to the next step.

4. Running the project

Go to Run and select Debug Configurations. There will be four debug configurations for this project:

Configuration Name Description
mpu_memory_protection_s32k148 Debug_RAM Jlink Debug the RAM configuration using Segger Jlink debuggers
mpu_memory_protection_s32k148 Debug_FLASH Jlink Debug the FLASH configuration using Segger Jlink debuggers
mpu_memory_protection_s32k148 Debug_RAM PEMicro Debug the RAM configuration using PEMicro debuggers
mpu_memory_protection_s32k148 Debug_FLASH PEMicro Debug the FLASH configuration using PEMicro debuggers


Select the desired debug configuration and click on Launch. Now the perspective will change to the Debug Perspective.
Use the controls to control the program flow.

Note
For more detailed information related to S32 Design Studio usage please consult the available documentation.

Notes


  • Please note that this example runs only on Flash configuration